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3x2x1=6 permutations.
There are 16 choices for the first number and 15 choices for the second number (since repetition is not allowed). Thus, there are a total of 16 x 15 = 240 two-number permutations.
There are 195 3-letter permutations.
10! permutations of the word "Arithmetic" may be made.
There are 151200.